As my loyal reader knows, I like to call the phase spiral in the vertical structure of the disk (what's sometimes called the Antoja spiral) by the name The Snail. Today I discussed with Suroor Gandhi (NYU) how we might use the Snail to measure the disk midplane, the local standard of rest (vertically), the mass density of the disk, and the run of this density with Galactocentric radius. We have a 9-parameter model to fit, in each angular-momentum slice. More as this develops!
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